Shared Projects

Branded Edition for uaviation.net

Turn Style Antenna PCB, designed for UAV use.

Production Ready

A 4MHz offset attenuator for radio direction finding.

Mostly based off this design with a few modifications:

• 3 position switch: Off, On (10db pad bypassed), and On with 10db pad.
• Better filtering LPF from 4MHz oscilator to mixer section, an LC instead of RC (replaced 100ohm resistor with 15uH inductor.) Should leak less RF.

The board is designed to fit into a ½" conduit pass-through box, like what you might put on the handle end of a measuring tape yagi (Google it; there are MANY plans and designs for them.)

Only parts that are “special” are:

• 2P3T Rotary Switch
• 15uH Inductor
• 10k Pot
• 4MHz Oscillator
• 5vDC TO-97 Regulator

The rest are just standard cheap-o resistors, capacitors and 1N4148 diodes, with values as labeled on the board.

Easiest way to get a hold of me is probably on Twitter: @SmittyHalibut. Shoot me a note with your experiences if you use this board! Thanks!

we all know the quality of chinese sensors, so I’ve made this board to test multiple sensors MQ series etc.

Measures Pollutants - Untested http://triembed.org/blog/?page_id=736

DO NOT ORDER HERE.

Instead download zip file then upload to OshStencils.com. This stencil should work for triple noctigon 20mm stars. Untested.

At OshStencils.com, scroll to the bottom 3 files. Select Engrave Top Stencil (other 2 files are automatically selected).

Change stencil border to 0.75

It will look like this when done.

Price is $2.49. OshStencils has a minimum charge of $5 so add a second one to your cart or add my Cree XM & XP stencil (unless want to pay $5 for one stencil). Shipping: USPS First class (no tracking) $0.70, w/ tracking $1.95, International $3.25.

For personal, non commercial use.
RMM / Richard McDougal of mtnelectronics.com may sell this on his site if he wishes. I sent him a copy some time ago.
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PIC 16F, 3 X 7 Segment

Wi2Wi W2SG0008i 1.575MHz GPS module add-on shield for Teensy 3.1. A mechanical switch toggles between UART and I2C output; 4K7 pullup resistors are on the SDA/SCL lines. Solder jumpers can be used to choose 4800 (default), 9600, and 38400 BAUD rates for NMEA protocol output to UART on Teensy Serial2, I2C supports both 100 kHz and 400 kHz rates. Solder jumpers can be used to take power and ground from the board edge transforming the shield into a conventional breakout board for breadboard use. The shield was designed for the 3V3 VIN of the Teensy but the LDK130 1.8V voltage regulator required by the GPS module can take up to 5.5V as input, making the shield in breakout-board mode ideal for any Arduino platform, even the Arduino UNO. The serial and I2C signals are logic level translated up to VIN on output from the board and down to the 1.8 V of the GPS module’s digital IO on input. There is a small SPDT button switch that sends the required ON/OFF signal to the GPS module. The passive chip antenna placement is less than perfect since it lacks a sufficiently ground-shielded feed line, which is not really wide enough to make the 50 Ohm needed. This is a compromise for the small size of the board, which allows the add-on function without overwhelming the Teensy form factor.

Thermocouple 1-wire interface

http://budgetlightforum.com/node/35674

budgetlightforum.com/node/35674

Control board for buoyancy engine

Flashes Some LEDs

951 Speedo and Boost Gauge Controller